Caliber was specified as 5.56×45mm with non-linked ammunition, so as to achieve commonality with existing service rifles.
An initial requirement for a magazine with a minimum capacity of 100 rounds was dropped in favor of the 30-round STANAG magazine because, at the start of testing, available 100-round magazines were unreliable. Characteristics desired in the weapon included: portability and maneuverability similarity in appearance to other rifles in the squad, reducing the likelihood that the gunner will receive special attention from the enemy facilitation of the gunner's participation in counter-insurgency operations and capability of maintaining a high volume of fire. The Infantry Automatic Rifle program began on 14 July 2005, when the Marine Corps sent Requests For Information to arms manufacturers. The Universal Need Statement spent six years going through the procurement process before an official program was begun and a list of required capabilities was created in early 2005. Experiences in Iraq and Afghanistan resulted in formal requests for recommendations. The key difference between a lighter infantry rifle and a more heavily built automatic rifle is the ability of the latter to maintain sustained continuous fire without: stoppages overheating the barrel or receiver or losing accuracy. Around 2000, the 1st Marine Division’s 2nd Battalion, 7th Marines Regiment conducted initial, limited IAR trials which confirmed the desirability of a light automatic rifle. In 1999, a Universal Need Statement was issued for an IAR. Trijicon ACOG, flip-up rear rotary diopter sight and front post Gas-operated short-stroke piston, rotating boltĬyclic: 700–900 rounds/min Sustained: 36 rounds/minĦ00 m (point target) 800 m (area target) Squad automatic weapon Assault rifle Designated marksman rifleħ.9 lb (3.6 kg) empty 9.8 lb (4.4 kg) loaded weight with sling ģ6.9 to 33 in (940 to 840 mm) w/adjustable stock Marine armed with an M27 IAR affixed with ACOG Squad Day Optic
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